%0 Journal Article %J New England Journal of Medicine %D 2021 %T Protection against Covid-19 by BNT162b2 Booster across Age Groups %A Bar-On, Yinon M. %A Goldberg, Yair %A Micha Mandel %A Bodenheimer, Omri %A Freedman, Laurence %A Alroy-Preis, Sharon %A Ash, Nachman %A Huppert, Amit %A Milo, Ron %B New England Journal of Medicine %V 385 %P 2421-2430 %G eng